Reinforced concrete construction.



APVLIOATION FILED AUG.29,1912.

Patented Jan. 27, 1914.

2 SHEETS-SHEET l.

//V VE N TOR G. KAHN. I

REINFORCED CONCRETE CONSTRUCTION.

APPLICATION FILED AUG. 29. 1912. 1,085,428. Patented Jan. 27, 1914.

2 SHEBTSSHBET 2.

I Y Y V v WITNESSES; fig. 61 ."mn/rtlvrofi iii? iJNiITED STATES GUSTAVE KAI-IN, OF

DETROIT, MICHIGAN.

REINFORCED CONCRETE CONSTRUCTION.

.,li't%.;,-i-2S. Specification of Letters Patent.

Application filed August 29. 1912.

Patented Jan. 27,1914. Serial No. 717,687.

To all us/m it may concern.

lie it ltnTiwn that I, Gts'ravi; KAIIX, a citizen of the United States, and a resident of vDetroit. county 'of \Vayne, and State of Michigan, have invented a new and Improved Reinforced Concrete Construction, of which the following a specification.

This invention relates to structures of reinforeiu'l concrete, and its object is to provide a column and slab construction which shall require a minimum of concrete and a minimum. of steel to sustain a given load on a predetermined area, and to provide reinforcing members for concrete floor construction which may be completely constructed at the factory at minimum cost.

"this invention consists of a novel reinforcement for concrete structures and the iatic-n thereof with concrete to form reed slabs, and comprises a series 9f ting rods, preferably evenly spacedcir-' rentially. and means connecting their inner ends. These groups of rods may be employed to reinforce the concrete immediately around the columns of concrete structures and especially adapted to reinforce panels of concrete floors.

In the accompanying drawings, Figure 1 plan showing the manner in which the *eing members of the present invennay be arranged to reinforce a concrete cture. Fig. 2 is a portion of a vertical .1011 through a floor-panel on a somewhat er scale. Fig. 3-is a plan showing the manner in which the reinforcements of this present invention may be. placed in connec tion with a steel frame construction. Figs. 4 and 5 are vertical sections through the center of a panel, on a larger scale, showing two ways of forming the rods. Fig. ti is an'==:her vertical section showing a slightly modified form of reinforcement.

in the carrying out of this invention, each of the members must be properly proportioned to meet the stress upon it, so that this description is prepared for engineers and others skilled in the art of concrete con struction. It will be understood that the number and dimensions of the rods and the sizes of the connectors in each panel or colnmn'may be varied to suit each individual structure or portion of structure in which this invention is to be employed. The term flat-slab is intended to designate a floor structure which is regarded as a unit, extending between well defined boundaries,

Y and usually comprising a panel or a series of panels which have a continuous flat lower face, broken only by the supporting columns. lVhere the floor is entirely of reinforced con crete, the term will include such structures as are formed with integral beams formed in the floor itself, between adjacent columns, by means of proper reinforcing members.-

This invention is clearly shown in the two plans, Figs. 1 and 3, of which Fig. l indicates a flat floor slab entirely formed of reinforced concrete and Fig. 3 showsthe. invention in combination with asteel frame. In Figs. land 2, a series of vertical rods 1 are shown in the columns 2 in the usual manner. Flat floor slabs 53 extend between the columns, and rods 4, of any reinforce bands or zones of this concrete slab to form beams. Any other desired method may be employed to reinforce the columns be clearly S8I1,'8&Ch quadrilateral space between four adjacent columns, and the beams connecting them, is a flat slab supported at its edges. It is thereforedesirable to so reinforce the slab that the stresses will be met as they occur. If the center of the slab were supported by a single concrete beam connecting to diagonally opposite columns, the reinforcement of that beam would usu-- ally consist of tension members placed in the bottom of -the concrete forming that beam. If two such beams joined at the also be at the bottom of the beams, and irrespective of the widthof the beams, would consist of parallel rods. The patent to Turner, No. 1,003,384 dated Sept. 12, 1911, is an example of an extreme type of this two-beam? construction, and in Fig. 13, that patent shows six reinforced concrete tire floor slab, two of the beams extending diagonally between columns and transmitting the stresses which occur between the side beams of the panel directly to. the columns. I31 the present invention, the reinforcements serve to create-a large number of beams extending radially from the center of the panel to the side beams, and incidentally to the column, each in the form of I a sector of a circle. As each radial beam is ing bar, the efficiency of this construction is very high. A strong ring 6 of steel has a desired type,

and to form these integral beams, as neither torms any part of this invention. As Wlll beams between four columns forming an en- "very narrow,having only a single reinforc-- center of the slab, the reinforcement would reinforces a beam which 15 an .in a, solid whole.

series of rods 7 connected to it, which'rods from, and incline downwardly into the concrete of the floor. This reinforcement, combined with the concrete of the column, forms a cantaliver of. great efiiciency. The concrete of the floor slab may] be of even thickness throughout, or it may be formed as shown in- Fig. 2, where the lower portion 10 is of a mixture well designed to resist compressiomand the portion 11, a light concrete made with cinder or other material. Itmay even be omitted entirely. The. tensional stresses per unit of area in a slab are greatest at the centerofa panel. With this construction, the amount of reinforcing material is greatest where the greatest stresses occur. a v i 1111 Figs. 3-, d and 5, the steel columns carry the steel beams 16. The'rings 17 at 'the'center of the panels unite the 'innerends of the rods-18, whose outer ends may be formedfinto hooks 19 which engage the upper fianges of the beams 16. These rods 18 are shown straight in Fig. l, but they may he horizontal as at 20 in' Fig. 5, with their ends 21 inclined upwardly so as to ex: tend ever the beams. The concrete 22 of the slabs is indicat d in dotted lines and may be homogeneous or of two kinds as shown in Fig. 2. In fact this concrete is merely incidental to the invention as it is well known in many forms and mixtures.

These reinforcing members may be assembled. at the factory, and secured together in bundles properly labeled for the respective panels where they are to be placed. The rings will unite the inner ends of the rods while the outer. ends may beheld together with a binder of wire.

and 20 and the rings 6, 8 and 17, may be of material of any desired cross section or deformation. While it is preferred that all the rods shall radiate from the centers, of the rings to which they are connected. it

' will be understood that a varian-e of the direction may be permitted, as it may be desired to have the rods extend" tangentially to the rings. i

Fig. 6 shows a slightly modified form of a cantaliver reinforcement together with the concrete and falsework. The boards 23 of the slab around therefor along its edges, and a metallic refioor panels beams therefor dividing the and a- 'metallic reinforcement for each panel consisting of a ring in the. center of the panel and The rods 7, 9, 18

the column-molds and the boards 24: ofQthe floor slab falsework may be ofany desir construction andmaterial and supported in any desired manner. :The vertical rods 1 are adapted to reinforce the column 2, while the concrete floor 25 will be of proper thick ness. A ring 26 is embedded in the concrete of the column'and tension members in the form of rods 27 extend downwardly from the ring into the floor slabf In order to support the ringin proper position until the concrete has set, the inner ends 28 of rods 27, after beingwoundaround the ring, may extend in such 'amanne'r thatfthey en gage the'boards 24 and thus support the ring. p

I claim- 1. A structure of reinforced concrete comprising a flat floor slab having supportingbeams along its edges and a metallic rein- 55 forcement for the slab-consisting" of a' ring positioned substantially central with ref erence to thesupports for the slab and a series of rods connecting to said ring by having their inner endswound around tilt/.

ring and'extendi'ng radially therefrom to the edges of theslab.

2. A structure of reinforcedconcrete comprising a flat floor slabjand supporting beams inforcement for said s} 'b consisting-of a ring positioned substantiany central with reference to the supports for the slab and a series of rods connecting to said ring by having their inner endswou'nd around the ring and extending radially therefrbm to said supporting beams.

3. An article of manufacture consisting. of a collapsible reinforcement for concrete and comprising a metal ring and metal rods each connected to the ring at one end and free at the other end so that the rods may be folded together-in the same manner as the ribs of an umbrella for convenience in shipping, and be spread out for embedding in the concrete.

4. A structure of reinforced concrete com prising a flat floor slab and supporting slab int'o' panels,

a seriesofrods connecting to said ringby having their inner ends wound around the ring and extending radially therefrom to said supporting beams, said rods being substantially evenly spacedcincumferentially. I v

5. In a concrete structure comprising columns' and floor slabs, means to reinforce the floor slabs between the columns, and means to reinforce the slabs immediately around thocolumns consisting of metal rings in said columns near the upper surface of the floor andaseries of rods wound around said rings and extending radially into the floor slabs, u

some of the rods having short ends next to the ring extending downwardly and slightly outwardly so that they may rest on the false- Worl: employed in erecting the floor to sup port the rings until the concrete sets.

6. In a structure of reinforced concrete con'iprising columns and a floor slab, means for r forcing the slab comprising rings in the columns near the upper face of the slab and other rings in the slabsnear their lower face and spaced centrally of the columns, and a series of radially extending rods connecting to each of said rings and having their ends overlappingthe ends of adjacent rods radiating from the columns.

i structure of reinforced concrete concrete columns and a concrete t ,or s a reinforcing rods extending between the columns to form reinforced beams dividing the slab into panels, metal rings in the columns and rods radiating therefrom, metal rings in the centers of said panels,

and rods connecting to said rings and extending radially into said beams and having their ends overlapping the ends of adjacent rods radiating from the columns.

S. In a structure of reinforced concrete comprising concrete columns and a concrete floor slab, reinforcing rods extending between the columns to form reinforced beams dividing the slab into panels, metal rings in the centers of said panels, and rods con necting to said rings and extending radially ,aes 3 each quadrilateral between four columns,vand

means to connect the inner ends of the rods.

1th In a structure of reinforced concrete, comprising columns and a floor slab, rods extending between the columns in the concrete of the floor to form reinforced beams and dividing the slab into panels; vertical reinforcing rods in the columns, radially extending rods in the columns inclining downwardly into the slab, a ring to connect the inner ends of each group of rods, radially extending rods in each panel, and a ring connecting the inner ends of each group of rods, the outer ends of each group of rods over-lapping the ends of the rods of the adjacent groups.

In testimony whereof I have signed this specification in the presence of two subscribing Witnesses. v

GUSTAVE KAHN. ,Vitnesses EDWARD N. PAGELSEN, FREDERICK KAHN. 

